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/*
* iplink_xdp.c XDP program loader
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Daniel Borkmann <daniel@iogearbox.net>
*/
#include <stdio.h>
#include <stdlib.h>
#include <linux/bpf.h>
#include "json_print.h"
#include "xdp.h"
#include "bpf_util.h"
extern int force;
struct xdp_req {
struct iplink_req *req;
__u32 flags;
};
static void xdp_ebpf_cb(void *raw, int fd, const char *annotation)
{
struct xdp_req *xdp = raw;
struct iplink_req *req = xdp->req;
struct rtattr *xdp_attr;
xdp_attr = addattr_nest(&req->n, sizeof(*req), IFLA_XDP);
addattr32(&req->n, sizeof(*req), IFLA_XDP_FD, fd);
if (xdp->flags)
addattr32(&req->n, sizeof(*req), IFLA_XDP_FLAGS, xdp->flags);
addattr_nest_end(&req->n, xdp_attr);
}
static const struct bpf_cfg_ops bpf_cb_ops = {
.ebpf_cb = xdp_ebpf_cb,
};
static int xdp_delete(struct xdp_req *xdp)
{
xdp_ebpf_cb(xdp, -1, NULL);
return 0;
}
int xdp_parse(int *argc, char ***argv, struct iplink_req *req, bool generic,
bool drv, bool offload)
{
struct bpf_cfg_in cfg = {
.argc = *argc,
.argv = *argv,
};
struct xdp_req xdp = {
.req = req,
};
if (!force)
xdp.flags |= XDP_FLAGS_UPDATE_IF_NOEXIST;
if (generic)
xdp.flags |= XDP_FLAGS_SKB_MODE;
if (drv)
xdp.flags |= XDP_FLAGS_DRV_MODE;
if (offload)
xdp.flags |= XDP_FLAGS_HW_MODE;
if (*argc == 1) {
if (strcmp(**argv, "none") == 0 ||
strcmp(**argv, "off") == 0)
return xdp_delete(&xdp);
}
if (bpf_parse_common(BPF_PROG_TYPE_XDP, &cfg, &bpf_cb_ops, &xdp))
return -1;
*argc = cfg.argc;
*argv = cfg.argv;
return 0;
}
static void xdp_dump_json(struct rtattr *tb[IFLA_XDP_MAX + 1])
{
__u32 prog_id = 0;
__u8 mode;
mode = rta_getattr_u8(tb[IFLA_XDP_ATTACHED]);
if (tb[IFLA_XDP_PROG_ID])
prog_id = rta_getattr_u32(tb[IFLA_XDP_PROG_ID]);
open_json_object("xdp");
print_uint(PRINT_JSON, "mode", NULL, mode);
if (prog_id)
bpf_dump_prog_info(NULL, prog_id);
close_json_object();
}
void xdp_dump(FILE *fp, struct rtattr *xdp, bool link, bool details)
{
struct rtattr *tb[IFLA_XDP_MAX + 1];
__u32 prog_id = 0;
__u8 mode;
parse_rtattr_nested(tb, IFLA_XDP_MAX, xdp);
if (!tb[IFLA_XDP_ATTACHED])
return;
mode = rta_getattr_u8(tb[IFLA_XDP_ATTACHED]);
if (mode == XDP_ATTACHED_NONE)
return;
else if (is_json_context())
return details ? (void)0 : xdp_dump_json(tb);
else if (details && link)
fprintf(fp, "%s prog/xdp", _SL_);
else if (mode == XDP_ATTACHED_DRV)
fprintf(fp, "xdp");
else if (mode == XDP_ATTACHED_SKB)
fprintf(fp, "xdpgeneric");
else if (mode == XDP_ATTACHED_HW)
fprintf(fp, "xdpoffload");
else
fprintf(fp, "xdp[%u]", mode);
if (tb[IFLA_XDP_PROG_ID])
prog_id = rta_getattr_u32(tb[IFLA_XDP_PROG_ID]);
if (!details) {
if (prog_id && !link)
fprintf(fp, "/id:%u", prog_id);
fprintf(fp, " ");
return;
}
if (prog_id) {
fprintf(fp, " ");
bpf_dump_prog_info(fp, prog_id);
}
}
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